"“Here is true missionary work in which labor and means can be invested with the best results. There has been too great fear of running risks, and moving out by faith, and sowing beside all waters. Opportunities have been presented which have not been grasped and made the most of. There has been too great fear of venturing. True faith is not presumption, but it ventures much. Precious light and powerful truth need to be brought out in publications without delay.” LS 217.4"
"In the morning sow thy seed, and in the evening withhold not thine hand: for thou knowest not whether shall prosper, either this or that, or whether they both shall be alike good."
The phrase "sowing beside all waters" is used in both passages, and the general theme of sowing without knowing the outcome is present in both.
"Now faith is the substance of things hoped for, the evidence of things not seen."
The EGW passage discusses faith and venturing, while Hebrews 11:1 defines faith. The connection is that the EGW passage illustrates the principle of faith defined in Hebrews 11:1, but it's not a direct quote or explicit allusion.